1/*
2 * Copyright © 2015 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24#include <stdio.h>
25#include <stdbool.h>
26#include <string.h>
27#include <math.h>
28
29#include "macros.h"
30#include "rounding.h"
31
32#include <gtest/gtest.h>
33
34TEST(Rounding, RoundevenFloat)
35{
36   const struct {
37      float input, expected;
38   } float_data[] = {
39      { 0.0,                  0.0 },
40      { nextafterf(0.5, 0.0), 0.0 },
41      { 0.5,                  0.0 },
42      { nextafterf(0.5, 1.0), 1.0 },
43      { 1.0,                  1.0 },
44      { nextafterf(1.5, 1.0), 1.0 },
45      { 1.5,                  2.0 },
46      { nextafterf(1.5, 2.0), 2.0 },
47      { 2.0,                  2.0 },
48      { nextafterf(2.5, 2.0), 2.0 },
49      { 2.5,                  2.0 },
50      { nextafterf(2.5, 3.0), 3.0 },
51   };
52
53   for (unsigned i = 0; i < ARRAY_SIZE(float_data); i++) {
54      float output = _mesa_roundevenf(float_data[i].input);
55      EXPECT_TRUE(memcmp(&float_data[i].expected, &output, sizeof(float)) == 0)
56         << "Subtest " << i << " float value: expected " << float_data[i].expected << " from "
57         << "_mesa_roundevenf(" << float_data[i].input << " but got " << output << "\n";
58   }
59
60   // Test negated values.
61   for (unsigned i = 0; i < ARRAY_SIZE(float_data); i++) {
62      float output = _mesa_roundevenf(-float_data[i].input);
63      float negated_expected = -float_data[i].expected;
64      EXPECT_TRUE(memcmp(&negated_expected, &output, sizeof(float)) == 0)
65         << "Subtest " << i << " float value: expected " << negated_expected << " from "
66         << "_mesa_roundevenf(" << -float_data[i].input << " but got " << output << "\n";
67   }
68}
69
70TEST(Rounding, RoundevenDouble)
71{
72   const struct {
73      double input, expected;
74   } double_data[] = {
75      { 0.0,                 0.0 },
76      { nextafter(0.5, 0.0), 0.0 },
77      { 0.5,                 0.0 },
78      { nextafter(0.5, 1.0), 1.0 },
79      { 1.0,                 1.0 },
80      { nextafter(1.5, 1.0), 1.0 },
81      { 1.5,                 2.0 },
82      { nextafter(1.5, 2.0), 2.0 },
83      { 2.0,                 2.0 },
84      { nextafter(2.5, 2.0), 2.0 },
85      { 2.5,                 2.0 },
86      { nextafter(2.5, 3.0), 3.0 },
87   };
88
89   for (unsigned i = 0; i < ARRAY_SIZE(double_data); i++) {
90      double output = _mesa_roundeven(double_data[i].input);
91      EXPECT_TRUE(memcmp(&double_data[i].expected, &output, sizeof(double)) == 0)
92         << "Subtest " << i << " double value: expected " << double_data[i].expected << " from "
93         << "_mesa_roundeven(" << double_data[i].input << " but got " << output << "\n";
94   }
95
96   // Test negated values.
97   for (unsigned i = 0; i < ARRAY_SIZE(double_data); i++) {
98      double output = _mesa_roundeven(-double_data[i].input);
99      double negated_expected = -double_data[i].expected;
100      EXPECT_TRUE(memcmp(&negated_expected, &output, sizeof(double)) == 0)
101         << "Subtest " << i << " double value: expected " << negated_expected << " from "
102         << "_mesa_roundeven(" << -double_data[i].input << " but got " << output << "\n";
103   }
104}
105